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Blackfin arch: flush/inv the correct range when using write back cache and fix bugs find by dmacopy 

- flush/inv the correct range
 - dmacopy test failed when policy is write_back - invalidate before dma
   http://blackfin.uclinux.org/gf/project/uclinux-dist/tracker/?action=TrackerItemEdit&tracker_item_id=3367
   It's the cache invalidate what is causing the issue.
   There is no invalidate only instruction it's always: FLUSHINV
   So when we "invalidate" after the DMA we might (do) overwrite freshly 
   dma'ed data by dirty Cache WB content.

   Fixed by moving the "invalidate" at the beginning of dma_memcpy.

Signed-off-by: Michael Hennerich <michael.hennerich@analog.com>
Signed-off-by: Bryan Wu <bryan.wu@analog.com>
This commit is contained in:
Michael Hennerich 2007-10-10 17:42:55 +08:00 committed by Bryan Wu
parent a359cca71e
commit 1a7d91d651
1 changed files with 30 additions and 9 deletions
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39
arch/blackfin/kernel/bfin_dma_5xx.c
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@ -436,6 +436,10 @@ static void *__dma_memcpy(void *dest, const void *src, size_t size)
blackfin_dcache_flush_range((unsigned int)src,
(unsigned int)(src + size));
if ((unsigned long)dest < memory_end)
blackfin_dcache_invalidate_range((unsigned int)dest,
(unsigned int)(dest + size));
bfin_write_MDMA_D0_IRQ_STATUS(DMA_DONE | DMA_ERR);
if ((unsigned long)src < (unsigned long)dest)
@ -543,6 +547,8 @@ static void *__dma_memcpy(void *dest, const void *src, size_t size)
}
}
SSYNC();
while (!(bfin_read_MDMA_D0_IRQ_STATUS() & DMA_DONE))
;
@ -552,9 +558,6 @@ static void *__dma_memcpy(void *dest, const void *src, size_t size)
bfin_write_MDMA_S0_CONFIG(0);
bfin_write_MDMA_D0_CONFIG(0);
if ((unsigned long)dest < memory_end)
blackfin_dcache_invalidate_range((unsigned int)dest,
(unsigned int)(dest + size));
local_irq_restore(flags);
return dest;
@ -589,7 +592,8 @@ void dma_outsb(unsigned long addr, const void *buf, unsigned short len)
local_irq_save(flags);
blackfin_dcache_flush_range((unsigned int)buf, (unsigned int)(buf) + len);
blackfin_dcache_flush_range((unsigned int)buf,
(unsigned int)(buf) + len);
bfin_write_MDMA_D0_START_ADDR(addr);
bfin_write_MDMA_D0_X_COUNT(len);
@ -604,6 +608,8 @@ void dma_outsb(unsigned long addr, const void *buf, unsigned short len)
bfin_write_MDMA_S0_CONFIG(DMAEN | WDSIZE_8);
bfin_write_MDMA_D0_CONFIG(WNR | DI_EN | DMAEN | WDSIZE_8);
SSYNC();
while (!(bfin_read_MDMA_D0_IRQ_STATUS() & DMA_DONE));
bfin_write_MDMA_D0_IRQ_STATUS(DMA_DONE | DMA_ERR);
@ -620,6 +626,9 @@ void dma_insb(unsigned long addr, void *buf, unsigned short len)
{
unsigned long flags;
blackfin_dcache_invalidate_range((unsigned int)buf,
(unsigned int)(buf) + len);
local_irq_save(flags);
bfin_write_MDMA_D0_START_ADDR(buf);
bfin_write_MDMA_D0_X_COUNT(len);
@ -634,7 +643,7 @@ void dma_insb(unsigned long addr, void *buf, unsigned short len)
bfin_write_MDMA_S0_CONFIG(DMAEN | WDSIZE_8);
bfin_write_MDMA_D0_CONFIG(WNR | DI_EN | DMAEN | WDSIZE_8);
blackfin_dcache_invalidate_range((unsigned int)buf, (unsigned int)(buf) + len);
SSYNC();
while (!(bfin_read_MDMA_D0_IRQ_STATUS() & DMA_DONE));
@ -653,7 +662,8 @@ void dma_outsw(unsigned long addr, const void *buf, unsigned short len)
local_irq_save(flags);
blackfin_dcache_flush_range((unsigned int)buf, (unsigned int)(buf) + len);
blackfin_dcache_flush_range((unsigned int)buf,
(unsigned int)(buf) + len * sizeof(short));
bfin_write_MDMA_D0_START_ADDR(addr);
bfin_write_MDMA_D0_X_COUNT(len);
@ -668,6 +678,8 @@ void dma_outsw(unsigned long addr, const void *buf, unsigned short len)
bfin_write_MDMA_S0_CONFIG(DMAEN | WDSIZE_16);
bfin_write_MDMA_D0_CONFIG(WNR | DI_EN | DMAEN | WDSIZE_16);
SSYNC();
while (!(bfin_read_MDMA_D0_IRQ_STATUS() & DMA_DONE));
bfin_write_MDMA_D0_IRQ_STATUS(DMA_DONE | DMA_ERR);
@ -683,6 +695,9 @@ void dma_insw(unsigned long addr, void *buf, unsigned short len)
{
unsigned long flags;
blackfin_dcache_invalidate_range((unsigned int)buf,
(unsigned int)(buf) + len * sizeof(short));
local_irq_save(flags);
bfin_write_MDMA_D0_START_ADDR(buf);
@ -698,7 +713,7 @@ void dma_insw(unsigned long addr, void *buf, unsigned short len)
bfin_write_MDMA_S0_CONFIG(DMAEN | WDSIZE_16);
bfin_write_MDMA_D0_CONFIG(WNR | DI_EN | DMAEN | WDSIZE_16);
blackfin_dcache_invalidate_range((unsigned int)buf, (unsigned int)(buf) + len);
SSYNC();
while (!(bfin_read_MDMA_D0_IRQ_STATUS() & DMA_DONE));
@ -717,7 +732,8 @@ void dma_outsl(unsigned long addr, const void *buf, unsigned short len)
local_irq_save(flags);
blackfin_dcache_flush_range((unsigned int)buf, (unsigned int)(buf) + len);
blackfin_dcache_flush_range((unsigned int)buf,
(unsigned int)(buf) + len * sizeof(long));
bfin_write_MDMA_D0_START_ADDR(addr);
bfin_write_MDMA_D0_X_COUNT(len);
@ -732,6 +748,8 @@ void dma_outsl(unsigned long addr, const void *buf, unsigned short len)
bfin_write_MDMA_S0_CONFIG(DMAEN | WDSIZE_32);
bfin_write_MDMA_D0_CONFIG(WNR | DI_EN | DMAEN | WDSIZE_32);
SSYNC();
while (!(bfin_read_MDMA_D0_IRQ_STATUS() & DMA_DONE));
bfin_write_MDMA_D0_IRQ_STATUS(DMA_DONE | DMA_ERR);
@ -747,6 +765,9 @@ void dma_insl(unsigned long addr, void *buf, unsigned short len)
{
unsigned long flags;
blackfin_dcache_invalidate_range((unsigned int)buf,
(unsigned int)(buf) + len * sizeof(long));
local_irq_save(flags);
bfin_write_MDMA_D0_START_ADDR(buf);
@ -762,7 +783,7 @@ void dma_insl(unsigned long addr, void *buf, unsigned short len)
bfin_write_MDMA_S0_CONFIG(DMAEN | WDSIZE_32);
bfin_write_MDMA_D0_CONFIG(WNR | DI_EN | DMAEN | WDSIZE_32);
blackfin_dcache_invalidate_range((unsigned int)buf, (unsigned int)(buf) + len);
SSYNC();
while (!(bfin_read_MDMA_D0_IRQ_STATUS() & DMA_DONE));